(中南工业大学冶金物理化学及化学新材料研究所, 长沙 410083)
摘 要: 研究了化学镀镍法对贮氢合金粉末表面镀镍的工艺。该法无需经过PdCl2活化,在含有0.20 mol/L NiSO4,0.40 mol/L NaH2PO2, 0.06 mol/L Na3C6H5O7, 0.56 mol/LNH4Cl的溶液中, 控制pH9.0~9.5, 温度50℃, 镀镍时间25~30 min,可以得到镀镍量为9%~20%(质量分数)的镍镀层。SEM形貌分析表明,获得的镀层厚度和成分均匀,镀层中含有5%(质量分数)的P元素。X射线衍射分析结果显示出镀层为一种非晶态结构。
关键字: 关键词: 贮氢合金 化学镀镍 表面修饰
(Institute of Metallurgical Physicochemistry and Materials,Central South University of Technology, Changsha 410083, P. R. China)
Abstract:Particles of hydrogen-storage alloy La(NiSnCo)5.12 have been modified with nickel film by means of a chemical plating process without the activation of PdCl2. The amount of deposited nickel can be controlled within 9%~20%(mass fraction) under conditions of 0.20 mol/L NiSO4,0.40 mol/L NaH2PO2, 0.06 mol/L Na3C6H5O7, 0.56 mol/L NH4Cl, pH 9.0~9.5, temperature 50 ℃ and plating time 25~30 min. The SEM morphology showed that the nickel layer is homogenous. X-ray diffraction analysis showed that the layer is an amorphous structure.
Key words: hydrogen-storage alloy nickel-microencapsulation
surface modification